Answer:
1- The addition of Texas added to the happening to the Mexican-American War
2- The contention began, to a limited extent, over a contradiction about which waterway was Mexico's actual northern fringe: the Nueces or the Rio Grande
Explanation:
The fundamental driver of the war was the affirmation of Texas into the United States of America. Since Mexico didn't perceive Texas' freedom after their effective resistance to the Mexican government it was viewed as an intrusion into Mexican domain once Texas acknowledged the greeting into the United States.
B. He believed individual states should decide if they wanted slavery
D. He believed Illinois had the right to abolish slavery
Explanation: Took the assignment